In this new era of technology securing information in internet has become a crucial task. To secure such information, encryption plays an important role in information security. In this paper Vigenere cipher is considered which is to be most efficient and simplest one. Due to its repeating nature, it is vulnerable to attacks like Kasiski, known plain text etc., to find the length of encryption key. To overcome this, this research present a modified algorithm encryption technique is done by using Vigenere cipher to improve better security against cryptanalysis.
Encryption, Vigenere cipher, Cipher ceaser, Decryption, data security
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